Sierra 18-0564 Oil Seal, White, Replaces Mercury Marine 26-888483

The Sierra 18-0564 Oil Seal is a machined, white-finish seal designed for outboard powerhead applications where a reliable, leak-resistant seal is needed around a rotating shaft. Its compact size, measuring 0.39 x 0.39 x 0.39 inches, makes it suited for tight clearances found in outboard powerhead assemblies. The seal is built with a machined exterior for a consistent, precise fit, helping maintain proper sealing pressure and reduce the risk of oil or lubricant leakage during operation.

This oil seal is a universal-fit component, meaning it is not restricted to a single engine family, and it directly replaces Mercury Marine part number 26-888483, making it a straightforward swap for boat owners and technicians performing powerhead seal maintenance. At just 0.01 pounds, it is a lightweight, small-parts item that is easy to keep on hand for routine service work or as a spare when servicing Mercury outboard powerheads.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-0564
• Product Name: Oil Seal
• Color: White
• Fit Type: Universal Fit
• Exterior Finish: Machined
• Weight: 0.01 pounds
• Product Dimensions: 0.39 x 0.39 x 0.39 inches
• UPC: 808282200275
• OEM Cross Reference: Mercury Marine 26-888483

Fitment

This oil seal is a universal-fit part and is not limited to a specific engine model or year range.

Replaces (OEM)

• Mercury Marine 26-888483

Frequently Asked Questions

What is the Sierra 18-0564 oil seal used for? The Sierra 18-0564 is an oil seal designed to prevent lubricant leakage around a rotating shaft in an outboard powerhead, helping maintain proper internal sealing during engine operation.

Does the 18-0564 oil seal replace an OEM Mercury part? Yes, the Sierra 18-0564 oil seal directly replaces Mercury Marine part number 26-888483.

What color is the Sierra 18-0564 oil seal? This oil seal is white in color.

How big is the Sierra 18-0564 oil seal? The Sierra 18-0564 measures 0.39 x 0.39 x 0.39 inches, a compact size intended for tight powerhead clearances.

How much does the 18-0564 oil seal weigh? It weighs 0.01 pounds, making it a lightweight small-parts item.

Is the Sierra 18-0564 a universal-fit part? Yes, the 18-0564 oil seal is listed as a universal fit rather than being restricted to one specific engine model.

What finish does the Sierra 18-0564 oil seal have? The seal has a machined exterior finish, which supports a precise, consistent fit for sealing performance.

Is the Sierra 18-0564 an aftermarket or genuine Mercury part? The 18-0564 is a Sierra-branded aftermarket oil seal that cross-references to and replaces Mercury Marine 26-888483.

What UPC is associated with the Sierra 18-0564 oil seal? The UPC for the Sierra 18-0564 oil seal is 808282200275.

Can I use the Sierra 18-0564 as a spare part for powerhead maintenance? Yes, due to its small size and low weight of 0.01 pounds, the 18-0564 oil seal is practical to keep on hand as a spare for outboard powerhead servicing.